Wrong first release number when using autoincrement

Octopus v2018.2.1, scenario and result:
- Test package version: 14.27.2.0223-uat
- Project Settings -> Release Versioning -> Use the version number from included package (Test package)
- Create Release -> Octopus automatically set version to 14.27.2.0223-uat, I change it to 14.27.2.0223-uat.i
- Release created with number 14.27.2.0223-0, instead 14.27.2.0223-uat.0 or 14.27.2.0223-uat
- What's more interesting, second or any next release is created properly, as f.ex. 14.27.2.0223-uat.1

Same bug when using octo.exe to create releases, first release is always wrong.